Abstract
YBa2Cu3O7−x+Y2O3 (YBCO+Y2O3) mixed filmswere prepared on SrTiO3/MgO substrates by pulsed-laser deposition from a YBCO target with a thinY2O3 sector on the top. The pinning properties for the mixedYBCO+Y2O3 thin filmwere strongly enhanced, especially at the temperatures lower than 77 K: the maximum global pinning forcesFP for theY2O3 doped sampleare 7.8 GN m−3 near 2 T at77 K, 54.5 GN m−3 near 4 T at65 K, and 189 GN m−3 near9 T at 40 K. In the Y2O3-added samples, except for the plane configuration, the angular dependence ofJc showed a plateau, due to the flux pinning by isotropic pinning centres.Y2O3 nanoparticles randomly dispersed inside the YBCO matrix were consistently observed inthe cross-sectional TEM images.
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